reftex-cleveref-cref is defined on the fly in reftex-ref.el from the contents of reftex-ref-style-alist. No autoload is associated with it. So it is defined only when reftex-ref.el is loaded which, in turn, is provoked by the autoload cookie on reftex-reference.
I wrote an academic paper mostly in org-mode. The published paper is here https://pubs.acs.org/doi/abs/10.1021/jacs.7b08572.
And the repo I used to make it is hosted here with the main org-mode source here: https://gitlab.com/salotz/Lotz2017sEHTPPUUnbinding/blob/master/paper/paper.org
As others have commented you will likely have to export to LaTeX to do ...
I can't reproduce your problem. I made a small example org-mode file:
Here's the code used to configure Emacs:
'( "xelatex -shell-escape -interaction nonstopmode -output-directory %o %f"
"xelatex -shell-escape -interaction nonstopmode -output-directory %o %f"
"xelatex -shell-escape -interaction ...
Citation from the section "String Definitions" in the info manual of Ebib:
Having defined ‘@string’ definitions, there must of course be a way
to use them. Just giving a field a string abbreviation as value will
not do, because Ebib puts braces around the value that you enter when it
writes the ‘.bib’ file, so that BibTeX will not recognise the